I would add that in level flight at 1g, my spar pins are as easy to rotate
in their holes as when sat on the ground.
DMcF.
> On 11 August 2019 at 09:19 D McFadyean <ami-mcfadyean@talktalk.net> wrote
:
>
>
> That analysis assumes the fuselage structure to be inelastic and utte
rly unyielding, whilst the spar is privaleged to flex.
>
> All of the vertical loads going in to the lift pins have to pass thro
ugh the fus structure too, which will yield to a greater or lesser extent.
>
>
> Duncan Mcf.
>
> > > On 10 August 2019 at 22:47 Pete <peterz@zutrasoft.com> wrote:
> >
> >
> > What i have never understood, is why the cockpit module spar pi
n bushings are not vertical slots, because when the wings are flexing under
G, the lift pins take the fuse lift loads, and the spar flexing (under po
sitive G) actually force the spar pins _downard_ against the cockpit modul
e....obviously totally counter-productive.
> >
> > Pete
> > A239
> >
> > On Aug 10, 2019, at 5:29 PM, Bud Yerly < budyerly@msn.com mailt
o:budyerly@msn.com > wrote:
> >
> >
> > > > >
> > > Fred,
> > >
> > > Back before my time when mod 52 was done for the GW incre
ase. The classic had two 3/8 pins originally. Mod 52 uses the =C2=BD inch
pins and a spar strap .
> > >
> > >
> > >
> > > As the wings pull forward under load, the fuselage would
flex so they put in the cross bar and the new sockets.
> > >
> > >
> > >
> > > Then the concern was that the starboard wing spar could b
ecome dislodged from the socket and interfere with controls. The quick fix
was to hold in the spar tip with a pip pin. The port wing was figured wou
ld stay put, and the spar strap would prevent flexing of the spar.
> > >
> > >
> > >
> > > That is all I know. Andy would have the particulars on t
he detailed history. It sort of all makes sense.
> > >
> > >
> > >
> > > Best Regards,
> > >
> > > Bud Yerly
> > >
> > >
> > >
> > > Sent from Mail https://go.microsoft.com/fwlink/?LinkId=
550986 for Windows 10
> > >
> > >
> > >
> > >
> > > ---------------------------------------------
> > > From: owner-europa-list-server@matronics.com mailto:owner
-europa-list-server@matronics.com <owner-europa-list-server@matronics.com m
ailto:owner-europa-list-server@matronics.com > on behalf of Fred Klein <fre
ddythek10@gmail.com mailto:freddythek10@gmail.com >
> > > Sent: Thursday, August 8, 2019 1:29:43 AM
> > > To: europa-list <europa-list@matronics.com mailto:europa-
list@matronics.com >
> > > Subject: Re: Europa-List: Reaming of spar and CM bushes
> > >
> > > Budyou mention the use of the SouthCo pip pin on
the port side and the Allen bolt pin on starboard.
> > >
> > > Do you know the reason for using different types of pins
here?
> > >
> > > Is there any downside to using SouthCo pip pins both port
and starboard?seems I=99ve heard that some builders have do
ne so.
> > >
> > > Fred
> > >
> > >
> > > > > > > On Aug 7, 2019, at 8:35 PM, B
ud Yerly < budyerly@msn.com mailto:budyerly@msn.com > wrote:
> > > >
> > > > The SouthCo pip pin is nominally .4985 inches.
> > > > The Allen bolt pin for the starboard side is .497 t
o .495.
> > > >
> > > > > > >
> > >
> > > > >
> > >
>
>
>
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